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Heart rate variability in overactive bladder experimental model.

Lukasz Dobrek1, Piotr Thor

  • 1Pathophysiology Department, Jagiellonian University, Medical College, Cracow, Poland.

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Summary

Autonomic nervous system (ANS) dysfunction is implicated in overactive bladder (OAB). Heart rate variability (HRV) analysis in cyclophosphamide-induced OAB models revealed ANS disturbances, with VLF changes potentially indicating bladder inflammation progression.

Keywords:
autonomic nervous systemheart rate variabilityoveractive bladder

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Area of Science:

  • Urology
  • Autonomic Neuroscience
  • Cardiology

Background:

  • Overactive bladder (OAB) pathophysiology involves neurogenic and myogenic theories, with autonomic nervous system (ANS) dysfunction playing a role.
  • Cyclophosphamide administration is used to create experimental models of acute (AOAB) and chronic (COAB) overactive bladder.

Purpose of the Study:

  • To assess ANS activity in experimental AOAB and COAB models using heart rate variability (HRV) analysis.
  • To investigate the relationship between ANS function and OAB development.

Main Methods:

  • Acute OAB model induced by a single i.p. dose of cyclophosphamide (200 mg/kg).
  • Chronic OAB model induced by four i.p. administrations of cyclophosphamide (75 mg/kg).
  • 20-minute ECG recordings and subsequent HRV analysis under urethane anesthesia.

Main Results:

  • Insignificant differences in most time-domain HRV parameters (SDNN, rMSSD were significant, p < 0.05).
  • A decrease in total power (TP) and very low frequency (VLF) power was observed in the AOAB group.
  • The COAB group showed a decrease in low frequency (LF) and high frequency (HF) power.

Conclusions:

  • ANS disturbances, indicated by spectral parameter abnormalities, were present in both AOAB and COAB models.
  • The observed VLF changes, despite normalized LF and HF powers, may reflect the progression of bladder inflammation in OAB.
  • HRV analysis is a valuable tool for assessing ANS involvement in OAB pathophysiology.